A comparative study of the adsorption of chromium(VI) ions toC. vulgarisandZ. ramigera

Abstract

The adsorption of chromium(VI) ions to dead cells of Chlorella vulgaris and Zoogloea rssalgera was investigated in this study. Optimum initial pH of the adsorption medium was found as pH 2.0 for both microorganisms. Maximum adsorption rates of metal ions to Cvulgaris and Zramigera were obtained at temperatures ranging from 25 to 50 °C. The adsorption rate of metal ion increased by increasing metal ion concentration for Cvulgaris and Zramigera up to 200 and 75 mg 1⁻¹. respectively. Freundlich constants were determined from Freundlich adsorption isotherms of two microorganisms.